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Asteraceae
Helianthus

not marked as a favorite taxon Helianthus dowellianus M.A. Curtis. Common name: Naked-stem Sunflower. Phenology: Jul-Oct. Habitat: Rocky or sandy flood-scoured riversides. Distribution: MD and DC (?) south to n. GA. Allegedly a Southern Appalachain endemic (perhaps occurring in the upper piedmont; the distribution needing verification).

Glossary (beta!)

Origin/Endemic status: Native

Taxonomy Comments: Ssp. occidentalis occupies most of the range of the species. Ssp. plantagineus (Torrey & Gray) Shinners occurs in sw. LA, se. TX, and AR. Var. dowellianus Torrey & Gray, of uncertain status (if valid, then usually treated as a variety under ssp. occidentalis), occurs in the Appalachian portion of the range.

Other Comments: The species has been collected only twice in NC, the type collection of H. dowellianus M.A. Curtis, from "near Franklin, Macon Co.", and in 1897, near Asheville, Buncombe County ("sandy bottoms along the French Broad River near Biltmore"). GAHP reports H. occidentalis as a rare species in the state, from "limestone glades and barrens, rocky or cherty soils" (GAHP 2003); it is uncertain what variety is represented. Collections exist from near DC (Along the Potomac).

Synonymy ⓘ: = WV; = Helianthus occidentalis Riddell — Tn; = Helianthus occidentalis Riddell var. dowellianus (M.A.Curtis) Torr. & A.Gray — C, F, SE1; < Helianthus occidentalis Riddell — G, RAB, S, W; < Helianthus occidentalis Riddell ssp. occidentalis — FNA21, K4, Va. Basionym: Helianthus dowellianus M.A.Curtis 1843

Links to other floras: < Helianthus occidentalis ssp. occidentalis - FNA21

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Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: FACU (taxonomic split from wetland indicator species)
  • Eastern Mountains and Piedmont: UPL (taxonomic split from wetland indicator species)
  • Great Plains: FACU (taxonomic split from wetland indicator species)
  • Midwest: FACU (taxonomic split from wetland indicator species)
  • Northcentral & Northeast: FACU (taxonomic split from wetland indicator species)

Heliophily ⓘ: 8

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Horticultural Information

No horticultural data found for this taxon.